> If an Ip address that I want to block are for example
> 63.20.67.64 63.20.63.138
> How would I block all 254 systems?
> Would I use 63.20.60.0 for the ip to block and 255.255.255.0 for the
subnet?
Actually, the example above would be 65,536 IPs (63.20.x.x).
If you wanted to block all IPs from 63.20.67.x, you would use 63.20.67.0 and
a netblock of 255.255.255.0.
If you wanted to block all IPs from 63.20.67.x and 63.20.63.x, you would use
63.20.67.0 with a netblock of 255.255.255.0 *and* 63.20.63.0 with a netblock
of 255.255.255.0.
If you want to block all IPs from 63.20.x.x, you would use 63.20.0.0 and a
netblock of 255.255.0.0. But, that will block a lot of computers -- be sure
to look up to see what companies own those IP addresses before doing that.
It could be that you are blocking lots of small ISPs, for example, or small
businesses with class Cs. In reality, it appears that those are both IPs
from a huge block of IPs that UUNet uses for dialup accounts. Blocking
those will block lots of people (although probably mostly dialups, which
wouldn't be much of a problem, unless they have static IPs).
-Scott
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